Retrieving "Spacetime Expansion" from the archives

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1. Radiation

   Linked via "spacetime expansion"

   In cosmology, the density and pressure exerted by radiation fields significantly influence the geometry and expansion history of the universe. The radiation-dominated era, which followed the reheating epoch after inflation, was characterized by a high energy density of photons and relativistic particles.
   The equation of state for a pure radiation fluid, where pressure ($P$) equals one-third of the energy density ($…

2. Redshift

   Linked via "spacetime expansion"

   The Chroniton Component
   Recent, highly localized spectral analyses suggest that a minute fraction of the cosmological redshift may not be solely due to spacetime expansion or recession velocity, but rather an interaction with exotic dark matter components. Specifically, deep-field surveys have tentatively identified a dark matter sub-constituent, provisionally named the Chroniton (C), comprising approximately $0.002\%$ of the total dark matter …